SITE INFORMATION AND CORRESPONDENCE_1987-1992

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CLEANUP AND ABATEMENT ORDER -2- LINCOLN PROPERTIES, LIMITED LINCOLN VILLAGE SHOPPING CENTER SAN JOAQUIN COUNTY dry cleaning businesses in the Shopping Center and used tetrachloroethyl- ene (PCE) as a cleaning agent in their operations. 8. The Lincoln Village Center is in Section 21 , T2N, R6E, MDB&M. 9. Along the Shopping Center' s western boundary are three municipal water supply wells owned and operated by the Lincoln Village Maintenance District (hereafter LVMD) , a special district in San Joaquin County. In 1985, the LVMD sampled these wells (LVMD Well Nos. 1 , 2 and 6) and found them to be contaminated with volatile organic compounds (VOCs) . A fourth unpolluted drinking water supply well , LVMD Well No. 4, lies adjacent to the southwest corner of the Shopping Center. 10. The highest VOC concentrations found in LVMD Well No. 1 were 120 micrograms per liter (µg/1) of PCE, 20 µg/1 of trichloroethylene (TCE) , 24 µg/l of trans-l-2-di chloroethylene (1 ,2-DCE) and 4 µg/1 of 1-2-dichlo- roethane (1 ,2-DCA) . 11. In 1985, LVMD Well No. 1 was repaired, resealed, flushed, monitored for one year and returned to service. However, the well ' s use was minimized because low levels of PCE (1.8 µg/l in 1989) were again detected. In 1986, LVMD Well No. 6 was removed from service when PCE levels increased to 19.5 µg/l , and in 1989, LVMD Well No. 2 was removed from service when PCE levels were detected at 70 µg/1 . Due to contamination, and the threat of contamination to other water supply wells, the San Joaquin County Department of Public Works has proposed to abandon LVMD Wells Nos. 1, 2, 4 and 6. 12. PCE is a solvent commonly used in the dry cleaning industry. TCE, 1,2- DCE, and 1 ,2-DCA are common breakdown products of PCE. The California Department of Health Services Primary Maximum Contaminant Levels are 5 µg/l for PCE and TCE, 10 µg/1 for trans-1 ,24CE , and 0.5 µg/l for 1 ,2-DCA 13. Sampling of sludges in the sewer lines under the Shopping Center by San Joaquin County in 1985, sampling of soil around and under sewer laterals originating at the dry cleaning establishments in 1988, and the results of a soil gas survey conducted in September 1989 have confirmed that the PCE contamination is from the dry cleaning operations. Some of the ground water pollution resulted from discharges to the sewer lines. 14. Sewer lines underlie the Shopping Center. Sewer lines off-site and adjacent to the Shopping Center property boundaries are owned by the San Joaquin County Department of Public Works and are maintained and operated by LVMD, with personnel of the Department of Public Works. LVMD pumps all sewage from the Shopping Center to the City of Stockton Main Water Quality Control Plant.